Calenderable thermoplastic compositions containing millable linear polyurethanes

Abstract

Thermoplastic synthetic polymeric compositions of certain polyurethanes, polyamides or chlorinated polyolefins, having processing temperatures in the range of about 150° to 325° F., can be modified by the addition of a millable thermoplastic polyurethane elastomer thereto to lower the processing temperature by 10° to 30° F. or more. This modification enables the thermoplastic composition to be processed on conventional calendering or extrusion equipment with a lesser amount of energy or with better performance. Also, coated fabrics of such thermoplastic compositions and a fiber reinforcement.

What is claimed is: 
     
       1. A thermoplastic composition having a reduced temperature of processing consisting essentially of a mixture of: (a) a first thermoplastic synthetic polymeric material of a polyolefin or a polyurethane having a processing temperature in the range of between about 150° to 325° F.; and   (b) in a sufficient amount of a second millable linear thermoplastic polyurethane elastomer having a pendent or extra linear group which contains at least one aliphatic non-benzenoid ##STR4##  moiety to lower the processing temperature of the first thermoplastic material by at least about 10° F.   
     
     
       2. The composition of claim 1 wherein the first thermoplastic material is present in an amount of between about 5 and 95 weight percent and the second polyurethane is present in an amount of between 95 and 5 weight percent, said weight percents based on the total weight of the composition. 
     
     
       3. The composition of claim 2 wherein the first thermoplastic material is present in an amount of between about 70 and 90 weight percent and the second polyurethane is present in an amount of between about 10 and 30 weight percent. 
     
     
       4. The composition of claim 1 wherein the second polyurethane is present in an amount sufficient to reduce the processing temperature of the first thermoplastic material by at least 20° F. 
     
     
       5. A thermoplastic synthetic polymer composition having a reduced temperature of processing comprising a mixture of: between about 95 and 5 weight percent of a first thermoplastic material of a polyolefin or polyurethane, said first thermoplastic material having a processing temperature in the range of between about 150° to 325° F.; and   a second millable linear thermoplastic having at least one pendent or extra linear group which contains at least one aliphatic non-benzenoid ##STR5##  group in an amount between about 5 to 95 weight percent to lower the processing temperature of the first thermoplastic material by at least about 15° F., said weight percents based on the total weight of the composition.   
     
     
       6. The composition of claim 5 wherein the first thermoplastic material is present in an amount of less than about 50 weight percent, the second thermoplastic polyurethane is present in an amount of about 50 weight percent or more, and the composition further comprises an agent for curing the second thermoplastic polyurethane which is added to the mixture to improve the tensile strength properties of the overall composition. 
     
     
       7. The composition of claim 5 wherein the first thermoplastic material is present in an amount of between about 70 and 90 weight percent and the second polyurethane is present in an amount of between about 10 and 30 weight percent. 
     
     
       8. A method for reducing the processing temperature of a first thermoplastic synthetic polymeric material of a polyolefin or a polyurethane which is normally processable at a temperature between about 150° to 325° F. which comprises adding thereto in a sufficient amount of a second millable thermoplastic polyurethane elastomer having a pendent or extra-linear group which contains at least one aliphatic, non-benzenoid ##STR6## moiety to reduce the processing temperature of the first thermoplastic material by at least about 10° F. 
     
     
       9. The method of claim 8 wherein the second polyurethane ##STR7## is present in an amount of at least about 5% by weight based on the weight of the composition. 
     
     
       10. The method of claim 9 wherein the first thermoplastic synthetic polymeric material is present in an amount of less than about 50% by weight and which method further comprises curing the thermoplastic composition to improve its overall properties. 
     
     
       11. The method of claim 8 wherein the first thermoplastic polyurethane is derived from a polyol of a polyether, polyester, polycarbonate or mixtures thereof. 
     
     
       12. The method of claim 8 wherein the polyolefin is a chlorinated polyethylene. 
     
     
       13. The method of claim 8 wherein the second polyurethane is present in an amount of at least 10% so that the processing temperature of the second thermoplastic material is reduced by at least about 20° F. 
     
     
       14. The thermoplastic composition produced by the method of claim 8.